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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.GwtCompatible;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.annotations.GwtIncompatible;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.base.Function;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.base.Optional;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.base.Predicate;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Collection;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Comparator;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Iterator;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.List;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.SortedSet;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>import javax.annotation.Nullable;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>/**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * {@code FluentIterable} provides a rich interface for manipulating {@code Iterable} instances in a<a name="line.37"></a>
<span class="sourceLineNo">038</span> * chained fashion. A {@code FluentIterable} can be created from an {@code Iterable}, or from a set<a name="line.38"></a>
<span class="sourceLineNo">039</span> * of elements. The following types of methods are provided on {@code FluentIterable}:<a name="line.39"></a>
<span class="sourceLineNo">040</span> * &lt;ul&gt;<a name="line.40"></a>
<span class="sourceLineNo">041</span> * &lt;li&gt;chained methods which return a new {@code FluentIterable} based in some way on the contents<a name="line.41"></a>
<span class="sourceLineNo">042</span> * of the current one (for example {@link #transform})<a name="line.42"></a>
<span class="sourceLineNo">043</span> * &lt;li&gt;conversion methods which copy the {@code FluentIterable}'s contents into a new collection or<a name="line.43"></a>
<span class="sourceLineNo">044</span> * array (for example {@link #toList})<a name="line.44"></a>
<span class="sourceLineNo">045</span> * &lt;li&gt;element extraction methods which facilitate the retrieval of certain elements (for example<a name="line.45"></a>
<span class="sourceLineNo">046</span> * {@link #last})<a name="line.46"></a>
<span class="sourceLineNo">047</span> * &lt;li&gt;query methods which answer questions about the {@code FluentIterable}'s contents (for example<a name="line.47"></a>
<span class="sourceLineNo">048</span> * {@link #anyMatch})<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;/ul&gt;<a name="line.49"></a>
<span class="sourceLineNo">050</span> *<a name="line.50"></a>
<span class="sourceLineNo">051</span> * &lt;p&gt;Here is an example that merges the lists returned by two separate database calls, transforms<a name="line.51"></a>
<span class="sourceLineNo">052</span> * it by invoking {@code toString()} on each element, and returns the first 10 elements as an<a name="line.52"></a>
<span class="sourceLineNo">053</span> * {@code ImmutableList}: &lt;pre&gt;   {@code<a name="line.53"></a>
<span class="sourceLineNo">054</span> *<a name="line.54"></a>
<span class="sourceLineNo">055</span> *   FluentIterable<a name="line.55"></a>
<span class="sourceLineNo">056</span> *       .from(database.getClientList())<a name="line.56"></a>
<span class="sourceLineNo">057</span> *       .filter(activeInLastMonth())<a name="line.57"></a>
<span class="sourceLineNo">058</span> *       .transform(Functions.toStringFunction())<a name="line.58"></a>
<span class="sourceLineNo">059</span> *       .limit(10)<a name="line.59"></a>
<span class="sourceLineNo">060</span> *       .toList();}&lt;/pre&gt;<a name="line.60"></a>
<span class="sourceLineNo">061</span> *<a name="line.61"></a>
<span class="sourceLineNo">062</span> * Anything which can be done using {@code FluentIterable} could be done in a different fashion<a name="line.62"></a>
<span class="sourceLineNo">063</span> * (often with {@link Iterables}), however the use of {@code FluentIterable} makes many sets of<a name="line.63"></a>
<span class="sourceLineNo">064</span> * operations significantly more concise.<a name="line.64"></a>
<span class="sourceLineNo">065</span> *<a name="line.65"></a>
<span class="sourceLineNo">066</span> * @author Marcin Mikosik<a name="line.66"></a>
<span class="sourceLineNo">067</span> * @since 12.0<a name="line.67"></a>
<span class="sourceLineNo">068</span> */<a name="line.68"></a>
<span class="sourceLineNo">069</span>@Beta<a name="line.69"></a>
<span class="sourceLineNo">070</span>@GwtCompatible(emulated = true)<a name="line.70"></a>
<span class="sourceLineNo">071</span>public abstract class FluentIterable&lt;E&gt; implements Iterable&lt;E&gt; {<a name="line.71"></a>
<span class="sourceLineNo">072</span>  // We store 'iterable' and use it instead of 'this' to allow Iterables to perform instanceof<a name="line.72"></a>
<span class="sourceLineNo">073</span>  // checks on the _original_ iterable when FluentIterable.from is used.<a name="line.73"></a>
<span class="sourceLineNo">074</span>  private final Iterable&lt;E&gt; iterable;<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>  /** Constructor for use by subclasses. */<a name="line.76"></a>
<span class="sourceLineNo">077</span>  protected FluentIterable() {<a name="line.77"></a>
<span class="sourceLineNo">078</span>    this.iterable = this;<a name="line.78"></a>
<span class="sourceLineNo">079</span>  }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>  FluentIterable(Iterable&lt;E&gt; iterable) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>    this.iterable = checkNotNull(iterable);<a name="line.82"></a>
<span class="sourceLineNo">083</span>  }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>  /**<a name="line.85"></a>
<span class="sourceLineNo">086</span>   * Returns a fluent iterable that wraps {@code iterable}, or {@code iterable} itself if it<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * is already a {@code FluentIterable}.<a name="line.87"></a>
<span class="sourceLineNo">088</span>   */<a name="line.88"></a>
<span class="sourceLineNo">089</span>  public static &lt;E&gt; FluentIterable&lt;E&gt; from(final Iterable&lt;E&gt; iterable) {<a name="line.89"></a>
<span class="sourceLineNo">090</span>    return (iterable instanceof FluentIterable) ? (FluentIterable&lt;E&gt;) iterable<a name="line.90"></a>
<span class="sourceLineNo">091</span>        : new FluentIterable&lt;E&gt;(iterable) {<a name="line.91"></a>
<span class="sourceLineNo">092</span>          @Override<a name="line.92"></a>
<span class="sourceLineNo">093</span>          public Iterator&lt;E&gt; iterator() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>            return iterable.iterator();<a name="line.94"></a>
<span class="sourceLineNo">095</span>          }<a name="line.95"></a>
<span class="sourceLineNo">096</span>        };<a name="line.96"></a>
<span class="sourceLineNo">097</span>  }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>  /**<a name="line.99"></a>
<span class="sourceLineNo">100</span>   * Construct a fluent iterable from another fluent iterable. This is obviously never necessary,<a name="line.100"></a>
<span class="sourceLineNo">101</span>   * but is intended to help call out cases where one migration from {@code Iterable} to<a name="line.101"></a>
<span class="sourceLineNo">102</span>   * {@code FluentIterable} has obviated the need to explicitly convert to a {@code FluentIterable}.<a name="line.102"></a>
<span class="sourceLineNo">103</span>   *<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * @deprecated instances of {@code FluentIterable} don't need to be converted to<a name="line.104"></a>
<span class="sourceLineNo">105</span>   *     {@code FluentIterable}<a name="line.105"></a>
<span class="sourceLineNo">106</span>   */<a name="line.106"></a>
<span class="sourceLineNo">107</span>  @Deprecated<a name="line.107"></a>
<span class="sourceLineNo">108</span>  public static &lt;E&gt; FluentIterable&lt;E&gt; from(FluentIterable&lt;E&gt; iterable) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>    return checkNotNull(iterable);<a name="line.109"></a>
<span class="sourceLineNo">110</span>  }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>  /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * Returns a string representation of this fluent iterable, with the format<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * {@code [e1, e2, ..., en]}.<a name="line.114"></a>
<span class="sourceLineNo">115</span>   */<a name="line.115"></a>
<span class="sourceLineNo">116</span>  @Override<a name="line.116"></a>
<span class="sourceLineNo">117</span>  public String toString() {<a name="line.117"></a>
<span class="sourceLineNo">118</span>    return Iterables.toString(iterable);<a name="line.118"></a>
<span class="sourceLineNo">119</span>  }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>  /**<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * Returns the number of elements in this fluent iterable.<a name="line.122"></a>
<span class="sourceLineNo">123</span>   */<a name="line.123"></a>
<span class="sourceLineNo">124</span>  public final int size() {<a name="line.124"></a>
<span class="sourceLineNo">125</span>    return Iterables.size(iterable);<a name="line.125"></a>
<span class="sourceLineNo">126</span>  }<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>  /**<a name="line.128"></a>
<span class="sourceLineNo">129</span>   * Returns {@code true} if this fluent iterable contains any object for which<a name="line.129"></a>
<span class="sourceLineNo">130</span>   * {@code equals(element)} is true.<a name="line.130"></a>
<span class="sourceLineNo">131</span>   */<a name="line.131"></a>
<span class="sourceLineNo">132</span>  public final boolean contains(@Nullable Object element) {<a name="line.132"></a>
<span class="sourceLineNo">133</span>    return Iterables.contains(iterable, element);<a name="line.133"></a>
<span class="sourceLineNo">134</span>  }<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>  /**<a name="line.136"></a>
<span class="sourceLineNo">137</span>   * Returns a fluent iterable whose {@code Iterator} cycles indefinitely over the elements of<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * this fluent iterable.<a name="line.138"></a>
<span class="sourceLineNo">139</span>   *<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * &lt;p&gt;That iterator supports {@code remove()} if {@code iterable.iterator()} does. After<a name="line.140"></a>
<span class="sourceLineNo">141</span>   * {@code remove()} is called, subsequent cycles omit the removed element, which is no longer in<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * this fluent iterable. The iterator's {@code hasNext()} method returns {@code true} until<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * this fluent iterable is empty.<a name="line.143"></a>
<span class="sourceLineNo">144</span>   *<a name="line.144"></a>
<span class="sourceLineNo">145</span>   * &lt;p&gt;&lt;b&gt;Warning:&lt;/b&gt; Typical uses of the resulting iterator may produce an infinite loop. You<a name="line.145"></a>
<span class="sourceLineNo">146</span>   * should use an explicit {@code break} or be certain that you will eventually remove all the<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * elements.<a name="line.147"></a>
<span class="sourceLineNo">148</span>   */<a name="line.148"></a>
<span class="sourceLineNo">149</span>  public final FluentIterable&lt;E&gt; cycle() {<a name="line.149"></a>
<span class="sourceLineNo">150</span>    return from(Iterables.cycle(iterable));<a name="line.150"></a>
<span class="sourceLineNo">151</span>  }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>  /**<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * Returns the elements from this fluent iterable that satisfy a predicate. The<a name="line.154"></a>
<span class="sourceLineNo">155</span>   * resulting fluent iterable's iterator does not support {@code remove()}.<a name="line.155"></a>
<span class="sourceLineNo">156</span>   */<a name="line.156"></a>
<span class="sourceLineNo">157</span>  public final FluentIterable&lt;E&gt; filter(Predicate&lt;? super E&gt; predicate) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>    return from(Iterables.filter(iterable, predicate));<a name="line.158"></a>
<span class="sourceLineNo">159</span>  }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span>  /**<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * Returns the elements from this fluent iterable that are instances of class {@code type}.<a name="line.162"></a>
<span class="sourceLineNo">163</span>   *<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * @param type the type of elements desired<a name="line.164"></a>
<span class="sourceLineNo">165</span>   */<a name="line.165"></a>
<span class="sourceLineNo">166</span>  @GwtIncompatible("Class.isInstance")<a name="line.166"></a>
<span class="sourceLineNo">167</span>  public final &lt;T&gt; FluentIterable&lt;T&gt; filter(Class&lt;T&gt; type) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>    return from(Iterables.filter(iterable, type));<a name="line.168"></a>
<span class="sourceLineNo">169</span>  }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>  /**<a name="line.171"></a>
<span class="sourceLineNo">172</span>   * Returns {@code true} if any element in this fluent iterable satisfies the predicate.<a name="line.172"></a>
<span class="sourceLineNo">173</span>   */<a name="line.173"></a>
<span class="sourceLineNo">174</span>  public final boolean anyMatch(Predicate&lt;? super E&gt; predicate) {<a name="line.174"></a>
<span class="sourceLineNo">175</span>    return Iterables.any(iterable, predicate);<a name="line.175"></a>
<span class="sourceLineNo">176</span>  }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span>  /**<a name="line.178"></a>
<span class="sourceLineNo">179</span>   * Returns {@code true} if every element in this fluent iterable satisfies the predicate.<a name="line.179"></a>
<span class="sourceLineNo">180</span>   * If this fluent iterable is empty, {@code true} is returned.<a name="line.180"></a>
<span class="sourceLineNo">181</span>   */<a name="line.181"></a>
<span class="sourceLineNo">182</span>  public final boolean allMatch(Predicate&lt;? super E&gt; predicate) {<a name="line.182"></a>
<span class="sourceLineNo">183</span>    return Iterables.all(iterable, predicate);<a name="line.183"></a>
<span class="sourceLineNo">184</span>  }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>  /**<a name="line.186"></a>
<span class="sourceLineNo">187</span>   * Returns an {@link Optional} containing the first element in this fluent iterable that<a name="line.187"></a>
<span class="sourceLineNo">188</span>   * satisfies the given predicate, if such an element exists.<a name="line.188"></a>
<span class="sourceLineNo">189</span>   *<a name="line.189"></a>
<span class="sourceLineNo">190</span>   * &lt;p&gt;&lt;b&gt;Warning:&lt;/b&gt; avoid using a {@code predicate} that matches {@code null}. If {@code null}<a name="line.190"></a>
<span class="sourceLineNo">191</span>   * is matched in this fluent iterable, a {@link NullPointerException} will be thrown.<a name="line.191"></a>
<span class="sourceLineNo">192</span>   */<a name="line.192"></a>
<span class="sourceLineNo">193</span>  public final Optional&lt;E&gt; firstMatch(Predicate&lt;? super E&gt; predicate) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>    return Iterables.tryFind(iterable, predicate);<a name="line.194"></a>
<span class="sourceLineNo">195</span>  }<a name="line.195"></a>
<span class="sourceLineNo">196</span><a name="line.196"></a>
<span class="sourceLineNo">197</span>  /**<a name="line.197"></a>
<span class="sourceLineNo">198</span>   * Returns a fluent iterable that applies {@code function} to each element of this<a name="line.198"></a>
<span class="sourceLineNo">199</span>   * fluent iterable.<a name="line.199"></a>
<span class="sourceLineNo">200</span>   *<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * &lt;p&gt;The returned fluent iterable's iterator supports {@code remove()} if this iterable's<a name="line.201"></a>
<span class="sourceLineNo">202</span>   * iterator does. After a successful {@code remove()} call, this fluent iterable no longer<a name="line.202"></a>
<span class="sourceLineNo">203</span>   * contains the corresponding element.<a name="line.203"></a>
<span class="sourceLineNo">204</span>   */<a name="line.204"></a>
<span class="sourceLineNo">205</span>  public final &lt;T&gt; FluentIterable&lt;T&gt; transform(Function&lt;? super E, T&gt; function) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>    return from(Iterables.transform(iterable, function));<a name="line.206"></a>
<span class="sourceLineNo">207</span>  }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>  /**<a name="line.209"></a>
<span class="sourceLineNo">210</span>   * Applies {@code function} to each element of this fluent iterable and returns<a name="line.210"></a>
<span class="sourceLineNo">211</span>   * a fluent iterable with the concatenated combination of results.  {@code function}<a name="line.211"></a>
<span class="sourceLineNo">212</span>   * returns an Iterable of results.<a name="line.212"></a>
<span class="sourceLineNo">213</span>   *<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * &lt;p&gt;The returned fluent iterable's iterator supports {@code remove()} if this<a name="line.214"></a>
<span class="sourceLineNo">215</span>   * function-returned iterables' iterator does. After a successful {@code remove()} call,<a name="line.215"></a>
<span class="sourceLineNo">216</span>   * the returned fluent iterable no longer contains the corresponding element.<a name="line.216"></a>
<span class="sourceLineNo">217</span>   *<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * @since 13.0<a name="line.218"></a>
<span class="sourceLineNo">219</span>   */<a name="line.219"></a>
<span class="sourceLineNo">220</span>  public &lt;T&gt; FluentIterable&lt;T&gt; transformAndConcat(<a name="line.220"></a>
<span class="sourceLineNo">221</span>      Function&lt;? super E, ? extends Iterable&lt;T&gt;&gt; function) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>    return from(Iterables.concat(transform(function)));<a name="line.222"></a>
<span class="sourceLineNo">223</span>  }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>  /**<a name="line.225"></a>
<span class="sourceLineNo">226</span>   * Returns an {@link Optional} containing the first element in this fluent iterable.<a name="line.226"></a>
<span class="sourceLineNo">227</span>   * If the iterable is empty, {@code Optional.absent()} is returned.<a name="line.227"></a>
<span class="sourceLineNo">228</span>   *<a name="line.228"></a>
<span class="sourceLineNo">229</span>   * @throws NullPointerException if the first element is null; if this is a possibility, use<a name="line.229"></a>
<span class="sourceLineNo">230</span>   *     {@code iterator().next()} or {@link Iterables#getFirst} instead.<a name="line.230"></a>
<span class="sourceLineNo">231</span>   */<a name="line.231"></a>
<span class="sourceLineNo">232</span>  public final Optional&lt;E&gt; first() {<a name="line.232"></a>
<span class="sourceLineNo">233</span>    Iterator&lt;E&gt; iterator = iterable.iterator();<a name="line.233"></a>
<span class="sourceLineNo">234</span>    return iterator.hasNext()<a name="line.234"></a>
<span class="sourceLineNo">235</span>        ? Optional.of(iterator.next())<a name="line.235"></a>
<span class="sourceLineNo">236</span>        : Optional.&lt;E&gt;absent();<a name="line.236"></a>
<span class="sourceLineNo">237</span>  }<a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span>  /**<a name="line.239"></a>
<span class="sourceLineNo">240</span>   * Returns an {@link Optional} containing the last element in this fluent iterable.<a name="line.240"></a>
<span class="sourceLineNo">241</span>   * If the iterable is empty, {@code Optional.absent()} is returned.<a name="line.241"></a>
<span class="sourceLineNo">242</span>   *<a name="line.242"></a>
<span class="sourceLineNo">243</span>   * @throws NullPointerException if the last element is null; if this is a possibility, use<a name="line.243"></a>
<span class="sourceLineNo">244</span>   *     {@link Iterables#getLast} instead.<a name="line.244"></a>
<span class="sourceLineNo">245</span>   */<a name="line.245"></a>
<span class="sourceLineNo">246</span>  public final Optional&lt;E&gt; last() {<a name="line.246"></a>
<span class="sourceLineNo">247</span>    // Iterables#getLast was inlined here so we don't have to throw/catch a NSEE<a name="line.247"></a>
<span class="sourceLineNo">248</span><a name="line.248"></a>
<span class="sourceLineNo">249</span>    // TODO(kevinb): Support a concurrently modified collection?<a name="line.249"></a>
<span class="sourceLineNo">250</span>    if (iterable instanceof List) {<a name="line.250"></a>
<span class="sourceLineNo">251</span>      List&lt;E&gt; list = (List&lt;E&gt;) iterable;<a name="line.251"></a>
<span class="sourceLineNo">252</span>      if (list.isEmpty()) {<a name="line.252"></a>
<span class="sourceLineNo">253</span>        return Optional.absent();<a name="line.253"></a>
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<span class="sourceLineNo">255</span>      return Optional.of(list.get(list.size() - 1));<a name="line.255"></a>
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<span class="sourceLineNo">257</span>    Iterator&lt;E&gt; iterator = iterable.iterator();<a name="line.257"></a>
<span class="sourceLineNo">258</span>    if (!iterator.hasNext()) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>      return Optional.absent();<a name="line.259"></a>
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<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span>    /*<a name="line.262"></a>
<span class="sourceLineNo">263</span>     * TODO(kevinb): consider whether this "optimization" is worthwhile. Users<a name="line.263"></a>
<span class="sourceLineNo">264</span>     * with SortedSets tend to know they are SortedSets and probably would not<a name="line.264"></a>
<span class="sourceLineNo">265</span>     * call this method.<a name="line.265"></a>
<span class="sourceLineNo">266</span>     */<a name="line.266"></a>
<span class="sourceLineNo">267</span>    if (iterable instanceof SortedSet) {<a name="line.267"></a>
<span class="sourceLineNo">268</span>      SortedSet&lt;E&gt; sortedSet = (SortedSet&lt;E&gt;) iterable;<a name="line.268"></a>
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<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span>    while (true) {<a name="line.272"></a>
<span class="sourceLineNo">273</span>      E current = iterator.next();<a name="line.273"></a>
<span class="sourceLineNo">274</span>      if (!iterator.hasNext()) {<a name="line.274"></a>
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<span class="sourceLineNo">279</span><a name="line.279"></a>
<span class="sourceLineNo">280</span>  /**<a name="line.280"></a>
<span class="sourceLineNo">281</span>   * Returns a view of this fluent iterable that skips its first {@code numberToSkip}<a name="line.281"></a>
<span class="sourceLineNo">282</span>   * elements. If this fluent iterable contains fewer than {@code numberToSkip} elements,<a name="line.282"></a>
<span class="sourceLineNo">283</span>   * the returned fluent iterable skips all of its elements.<a name="line.283"></a>
<span class="sourceLineNo">284</span>   *<a name="line.284"></a>
<span class="sourceLineNo">285</span>   * &lt;p&gt;Modifications to this fluent iterable before a call to {@code iterator()} are<a name="line.285"></a>
<span class="sourceLineNo">286</span>   * reflected in the returned fluent iterable. That is, the its iterator skips the first<a name="line.286"></a>
<span class="sourceLineNo">287</span>   * {@code numberToSkip} elements that exist when the iterator is created, not when {@code skip()}<a name="line.287"></a>
<span class="sourceLineNo">288</span>   * is called.<a name="line.288"></a>
<span class="sourceLineNo">289</span>   *<a name="line.289"></a>
<span class="sourceLineNo">290</span>   * &lt;p&gt;The returned fluent iterable's iterator supports {@code remove()} if the<a name="line.290"></a>
<span class="sourceLineNo">291</span>   * {@code Iterator} of this fluent iterable supports it. Note that it is &lt;i&gt;not&lt;/i&gt;<a name="line.291"></a>
<span class="sourceLineNo">292</span>   * possible to delete the last skipped element by immediately calling {@code remove()} on the<a name="line.292"></a>
<span class="sourceLineNo">293</span>   * returned fluent iterable's iterator, as the {@code Iterator} contract states that a call<a name="line.293"></a>
<span class="sourceLineNo">294</span>   * to {@code * remove()} before a call to {@code next()} will throw an<a name="line.294"></a>
<span class="sourceLineNo">295</span>   * {@link IllegalStateException}.<a name="line.295"></a>
<span class="sourceLineNo">296</span>   */<a name="line.296"></a>
<span class="sourceLineNo">297</span>  public final FluentIterable&lt;E&gt; skip(int numberToSkip) {<a name="line.297"></a>
<span class="sourceLineNo">298</span>    return from(Iterables.skip(iterable, numberToSkip));<a name="line.298"></a>
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<span class="sourceLineNo">300</span><a name="line.300"></a>
<span class="sourceLineNo">301</span>  /**<a name="line.301"></a>
<span class="sourceLineNo">302</span>   * Creates a fluent iterable with the first {@code size} elements of this<a name="line.302"></a>
<span class="sourceLineNo">303</span>   * fluent iterable. If this fluent iterable does not contain that many elements,<a name="line.303"></a>
<span class="sourceLineNo">304</span>   * the returned fluent iterable will have the same behavior as this fluent iterable.<a name="line.304"></a>
<span class="sourceLineNo">305</span>   * The returned fluent iterable's iterator supports {@code remove()} if this<a name="line.305"></a>
<span class="sourceLineNo">306</span>   * fluent iterable's iterator does.<a name="line.306"></a>
<span class="sourceLineNo">307</span>   *<a name="line.307"></a>
<span class="sourceLineNo">308</span>   * @param size the maximum number of elements in the returned fluent iterable<a name="line.308"></a>
<span class="sourceLineNo">309</span>   * @throws IllegalArgumentException if {@code size} is negative<a name="line.309"></a>
<span class="sourceLineNo">310</span>   */<a name="line.310"></a>
<span class="sourceLineNo">311</span>  public final FluentIterable&lt;E&gt; limit(int size) {<a name="line.311"></a>
<span class="sourceLineNo">312</span>    return from(Iterables.limit(iterable, size));<a name="line.312"></a>
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<span class="sourceLineNo">314</span><a name="line.314"></a>
<span class="sourceLineNo">315</span>  /**<a name="line.315"></a>
<span class="sourceLineNo">316</span>   * Determines whether this fluent iterable is empty.<a name="line.316"></a>
<span class="sourceLineNo">317</span>   */<a name="line.317"></a>
<span class="sourceLineNo">318</span>  public final boolean isEmpty() {<a name="line.318"></a>
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<span class="sourceLineNo">321</span><a name="line.321"></a>
<span class="sourceLineNo">322</span>  /**<a name="line.322"></a>
<span class="sourceLineNo">323</span>   * Returns an {@code ImmutableList} containing all of the elements from this fluent iterable in<a name="line.323"></a>
<span class="sourceLineNo">324</span>   * proper sequence.<a name="line.324"></a>
<span class="sourceLineNo">325</span>   *<a name="line.325"></a>
<span class="sourceLineNo">326</span>   * @since 14.0 (since 12.0 as {@code toImmutableList()}).<a name="line.326"></a>
<span class="sourceLineNo">327</span>   */<a name="line.327"></a>
<span class="sourceLineNo">328</span>  public final ImmutableList&lt;E&gt; toList() {<a name="line.328"></a>
<span class="sourceLineNo">329</span>    return ImmutableList.copyOf(iterable);<a name="line.329"></a>
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<span class="sourceLineNo">331</span><a name="line.331"></a>
<span class="sourceLineNo">332</span>  /**<a name="line.332"></a>
<span class="sourceLineNo">333</span>   * Returns an {@code ImmutableList} containing all of the elements from this {@code<a name="line.333"></a>
<span class="sourceLineNo">334</span>   * FluentIterable} in the order specified by {@code comparator}.  To produce an {@code<a name="line.334"></a>
<span class="sourceLineNo">335</span>   * ImmutableList} sorted by its natural ordering, use {@code toSortedList(Ordering.natural())}.<a name="line.335"></a>
<span class="sourceLineNo">336</span>   *<a name="line.336"></a>
<span class="sourceLineNo">337</span>   * @param comparator the function by which to sort list elements<a name="line.337"></a>
<span class="sourceLineNo">338</span>   * @throws NullPointerException if any element is null<a name="line.338"></a>
<span class="sourceLineNo">339</span>   * @since 14.0 (since 13.0 as {@code toSortedImmutableList()}).<a name="line.339"></a>
<span class="sourceLineNo">340</span>   */<a name="line.340"></a>
<span class="sourceLineNo">341</span>  public final ImmutableList&lt;E&gt; toSortedList(Comparator&lt;? super E&gt; comparator) {<a name="line.341"></a>
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<span class="sourceLineNo">344</span><a name="line.344"></a>
<span class="sourceLineNo">345</span>  /**<a name="line.345"></a>
<span class="sourceLineNo">346</span>   * Returns an {@code ImmutableSet} containing all of the elements from this fluent iterable with<a name="line.346"></a>
<span class="sourceLineNo">347</span>   * duplicates removed.<a name="line.347"></a>
<span class="sourceLineNo">348</span>   *<a name="line.348"></a>
<span class="sourceLineNo">349</span>   * @since 14.0 (since 12.0 as {@code toImmutableSet()}).<a name="line.349"></a>
<span class="sourceLineNo">350</span>   */<a name="line.350"></a>
<span class="sourceLineNo">351</span>  public final ImmutableSet&lt;E&gt; toSet() {<a name="line.351"></a>
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<span class="sourceLineNo">354</span><a name="line.354"></a>
<span class="sourceLineNo">355</span>  /**<a name="line.355"></a>
<span class="sourceLineNo">356</span>   * Returns an {@code ImmutableSortedSet} containing all of the elements from this {@code<a name="line.356"></a>
<span class="sourceLineNo">357</span>   * FluentIterable} in the order specified by {@code comparator}, with duplicates (determined by<a name="line.357"></a>
<span class="sourceLineNo">358</span>   * {@code comparator.compare(x, y) == 0}) removed. To produce an {@code ImmutableSortedSet} sorted<a name="line.358"></a>
<span class="sourceLineNo">359</span>   * by its natural ordering, use {@code toSortedSet(Ordering.natural())}.<a name="line.359"></a>
<span class="sourceLineNo">360</span>   *<a name="line.360"></a>
<span class="sourceLineNo">361</span>   * @param comparator the function by which to sort set elements<a name="line.361"></a>
<span class="sourceLineNo">362</span>   * @throws NullPointerException if any element is null<a name="line.362"></a>
<span class="sourceLineNo">363</span>   * @since 14.0 (since 12.0 as {@code toImmutableSortedSet()}).<a name="line.363"></a>
<span class="sourceLineNo">364</span>   */<a name="line.364"></a>
<span class="sourceLineNo">365</span>  public final ImmutableSortedSet&lt;E&gt; toSortedSet(Comparator&lt;? super E&gt; comparator) {<a name="line.365"></a>
<span class="sourceLineNo">366</span>    return ImmutableSortedSet.copyOf(comparator, iterable);<a name="line.366"></a>
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<span class="sourceLineNo">368</span><a name="line.368"></a>
<span class="sourceLineNo">369</span>  /**<a name="line.369"></a>
<span class="sourceLineNo">370</span>   * Returns an immutable map for which the elements of this {@code FluentIterable} are the keys in<a name="line.370"></a>
<span class="sourceLineNo">371</span>   * the same order, mapped to values by the given function. If this iterable contains duplicate<a name="line.371"></a>
<span class="sourceLineNo">372</span>   * elements, the returned map will contain each distinct element once in the order it first<a name="line.372"></a>
<span class="sourceLineNo">373</span>   * appears.<a name="line.373"></a>
<span class="sourceLineNo">374</span>   *<a name="line.374"></a>
<span class="sourceLineNo">375</span>   * @throws NullPointerException if any element of this iterable is {@code null}, or if {@code<a name="line.375"></a>
<span class="sourceLineNo">376</span>   *     valueFunction} produces {@code null} for any key<a name="line.376"></a>
<span class="sourceLineNo">377</span>   * @since 14.0<a name="line.377"></a>
<span class="sourceLineNo">378</span>   */<a name="line.378"></a>
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<span class="sourceLineNo">382</span><a name="line.382"></a>
<span class="sourceLineNo">383</span>  /**<a name="line.383"></a>
<span class="sourceLineNo">384</span>   * Creates an index {@code ImmutableListMultimap} that contains the results of applying a<a name="line.384"></a>
<span class="sourceLineNo">385</span>   * specified function to each item in this {@code FluentIterable} of values. Each element of this<a name="line.385"></a>
<span class="sourceLineNo">386</span>   * iterable will be stored as a value in the resulting multimap, yielding a multimap with the same<a name="line.386"></a>
<span class="sourceLineNo">387</span>   * size as this iterable. The key used to store that value in the multimap will be the result of<a name="line.387"></a>
<span class="sourceLineNo">388</span>   * calling the function on that value. The resulting multimap is created as an immutable snapshot.<a name="line.388"></a>
<span class="sourceLineNo">389</span>   * In the returned multimap, keys appear in the order they are first encountered, and the values<a name="line.389"></a>
<span class="sourceLineNo">390</span>   * corresponding to each key appear in the same order as they are encountered.<a name="line.390"></a>
<span class="sourceLineNo">391</span>   *<a name="line.391"></a>
<span class="sourceLineNo">392</span>   * @param keyFunction the function used to produce the key for each value<a name="line.392"></a>
<span class="sourceLineNo">393</span>   * @throws NullPointerException if any of the following cases is true:<a name="line.393"></a>
<span class="sourceLineNo">394</span>   *     &lt;ul&gt;<a name="line.394"></a>
<span class="sourceLineNo">395</span>   *       &lt;li&gt;{@code keyFunction} is null<a name="line.395"></a>
<span class="sourceLineNo">396</span>   *       &lt;li&gt;An element in this fluent iterable is null<a name="line.396"></a>
<span class="sourceLineNo">397</span>   *       &lt;li&gt;{@code keyFunction} returns {@code null} for any element of this iterable<a name="line.397"></a>
<span class="sourceLineNo">398</span>   *     &lt;/ul&gt;<a name="line.398"></a>
<span class="sourceLineNo">399</span>   * @since 14.0<a name="line.399"></a>
<span class="sourceLineNo">400</span>   */<a name="line.400"></a>
<span class="sourceLineNo">401</span>  public final &lt;K&gt; ImmutableListMultimap&lt;K, E&gt; index(Function&lt;? super E, K&gt; keyFunction) {<a name="line.401"></a>
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<span class="sourceLineNo">404</span><a name="line.404"></a>
<span class="sourceLineNo">405</span>  /**<a name="line.405"></a>
<span class="sourceLineNo">406</span>   * Returns an immutable map for which the {@link java.util.Map#values} are the elements of this<a name="line.406"></a>
<span class="sourceLineNo">407</span>   * {@code FluentIterable} in the given order, and each key is the product of invoking a supplied<a name="line.407"></a>
<span class="sourceLineNo">408</span>   * function on its corresponding value.<a name="line.408"></a>
<span class="sourceLineNo">409</span>   *<a name="line.409"></a>
<span class="sourceLineNo">410</span>   * @param keyFunction the function used to produce the key for each value<a name="line.410"></a>
<span class="sourceLineNo">411</span>   * @throws IllegalArgumentException if {@code keyFunction} produces the same key for more than one<a name="line.411"></a>
<span class="sourceLineNo">412</span>   *     value in this fluent iterable<a name="line.412"></a>
<span class="sourceLineNo">413</span>   * @throws NullPointerException if any element of this fluent iterable is null, or if<a name="line.413"></a>
<span class="sourceLineNo">414</span>   *     {@code keyFunction} produces {@code null} for any value<a name="line.414"></a>
<span class="sourceLineNo">415</span>   * @since 14.0<a name="line.415"></a>
<span class="sourceLineNo">416</span>   */<a name="line.416"></a>
<span class="sourceLineNo">417</span>  public final &lt;K&gt; ImmutableMap&lt;K, E&gt; uniqueIndex(Function&lt;? super E, K&gt; keyFunction) {<a name="line.417"></a>
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<span class="sourceLineNo">420</span><a name="line.420"></a>
<span class="sourceLineNo">421</span>  /**<a name="line.421"></a>
<span class="sourceLineNo">422</span>   * Returns an {@code ImmutableList} containing all of the elements from this<a name="line.422"></a>
<span class="sourceLineNo">423</span>   * fluent iterable in proper sequence.<a name="line.423"></a>
<span class="sourceLineNo">424</span>   *<a name="line.424"></a>
<span class="sourceLineNo">425</span>   * @deprecated Use {@link #toList()} instead. This method is scheduled for removal in Guava 15.0.<a name="line.425"></a>
<span class="sourceLineNo">426</span>   */<a name="line.426"></a>
<span class="sourceLineNo">427</span>  @Deprecated<a name="line.427"></a>
<span class="sourceLineNo">428</span>  public final ImmutableList&lt;E&gt; toImmutableList() {<a name="line.428"></a>
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<span class="sourceLineNo">431</span><a name="line.431"></a>
<span class="sourceLineNo">432</span>  /**<a name="line.432"></a>
<span class="sourceLineNo">433</span>   * Returns an {@code ImmutableList} containing all of the elements from this<a name="line.433"></a>
<span class="sourceLineNo">434</span>   * {@code FluentIterable} in the order specified by {@code comparator}.  To produce an<a name="line.434"></a>
<span class="sourceLineNo">435</span>   * {@code ImmutableList} sorted by its natural ordering, use<a name="line.435"></a>
<span class="sourceLineNo">436</span>   * {@code toSortedImmutableList(Ordering.natural())}.<a name="line.436"></a>
<span class="sourceLineNo">437</span>   *<a name="line.437"></a>
<span class="sourceLineNo">438</span>   * @param comparator the function by which to sort list elements<a name="line.438"></a>
<span class="sourceLineNo">439</span>   * @throws NullPointerException if any element is null<a name="line.439"></a>
<span class="sourceLineNo">440</span>   * @since 13.0<a name="line.440"></a>
<span class="sourceLineNo">441</span>   * @deprecated Use {@link #toSortedList(Comparator)} instead. This method is scheduled for removal<a name="line.441"></a>
<span class="sourceLineNo">442</span>   *     in Guava 15.0.<a name="line.442"></a>
<span class="sourceLineNo">443</span>   */<a name="line.443"></a>
<span class="sourceLineNo">444</span>  @Deprecated<a name="line.444"></a>
<span class="sourceLineNo">445</span>  public final ImmutableList&lt;E&gt; toSortedImmutableList(Comparator&lt;? super E&gt; comparator) {<a name="line.445"></a>
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<span class="sourceLineNo">448</span><a name="line.448"></a>
<span class="sourceLineNo">449</span>  /**<a name="line.449"></a>
<span class="sourceLineNo">450</span>   * Returns an {@code ImmutableSet} containing all of the elements from this<a name="line.450"></a>
<span class="sourceLineNo">451</span>   * fluent iterable with duplicates removed.<a name="line.451"></a>
<span class="sourceLineNo">452</span>   *<a name="line.452"></a>
<span class="sourceLineNo">453</span>   * @deprecated Use {@link #toSet()} instead. This method is scheduled for removal in Guava 15.0.<a name="line.453"></a>
<span class="sourceLineNo">454</span>   */<a name="line.454"></a>
<span class="sourceLineNo">455</span>  @Deprecated<a name="line.455"></a>
<span class="sourceLineNo">456</span>  public final ImmutableSet&lt;E&gt; toImmutableSet() {<a name="line.456"></a>
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<span class="sourceLineNo">459</span><a name="line.459"></a>
<span class="sourceLineNo">460</span>  /**<a name="line.460"></a>
<span class="sourceLineNo">461</span>   * Returns an {@code ImmutableSortedSet} containing all of the elements from this<a name="line.461"></a>
<span class="sourceLineNo">462</span>   * {@code FluentIterable} in the order specified by {@code comparator}, with duplicates<a name="line.462"></a>
<span class="sourceLineNo">463</span>   * (determined by {@code comparator.compare(x, y) == 0}) removed. To produce an<a name="line.463"></a>
<span class="sourceLineNo">464</span>   * {@code ImmutableSortedSet} sorted by its natural ordering, use<a name="line.464"></a>
<span class="sourceLineNo">465</span>   * {@code toImmutableSortedSet(Ordering.natural())}.<a name="line.465"></a>
<span class="sourceLineNo">466</span>   *<a name="line.466"></a>
<span class="sourceLineNo">467</span>   * @param comparator the function by which to sort set elements<a name="line.467"></a>
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